Thats crazy, in that short reply, you have managed to answer (in a round about way), a lot of the stuff i have been scouring the web for for the past two weeks.
I do like the idea of all the different and crazy stuff you can do with these progs and midi controllers. It was one of the main reasons i purchased a DJM 600 and the CDJ 400, to have a crack at the effects side of it, being pretty happy that i can mix. Although i completely appreciate that there are so many more effects and stuff you can now do to proper mash up!!
There is only 1 question i have, and i’m not sure if you’ll be able to answer it, and then i’ll leave you alone 
I’ve been reading up on recording your own mixes with traktor LE, PRO etc, and like you have said, you use audacity or garageband. Now this may come out wrong but i hope you understand and i dont look too stupid.
If i wanted to record my own mix, do i have to have the external sound card run into an external mixer before returning it to the sound card which in turn will play back on the pc?? (Hope that makes sense) Or can you have the soundcard output, go straight back into the input and do it that way??
Now, i know you can record mixes internally, but are you able to do this whilst still being able to use the headphone cueing on the controller??
Sorry if this sounds a bit long-winded or isnt explained very well, but thats the best way i can describe it. Basically, i want to be able to record my own mixes, with headphone cueing, with as little equipment as possible, therefore taking up as little room as possible!! The ideal would be if i could do it with just the PC, Controller and External Soundcard plus Audacity or the like.
Think thats about it and apologies in advance, bet your pleased you answered my first thread!! 